Dynamo-electric machine.



W. W. DEAN.

DYNAMO ELECTRIC MACHINE.

APPLICATION FILED JAN.28,1910.

w, m f w uw 1 m O MH .QN Q n0 m m w .Q NN N m a WW.. w .mu H |1H\ lmmw |l` lldm l l4\| ilrl/ n um f/ /mAIvWIM um W. m m Wl. N M m I m l M ,W l L 0J ii l W 1| l N |11 fl @N I. [I m m m. n .Q m lm. jf W W A x .u E nm NN ww S w, Nw mw s 7 vom N .KWPN i l n 1V W V.

l W. W. DEAN. 4 DYNAMO ELECTRIC MACHINE.

APPLICATION FILED JAN. 28,1910.

ww... Ph. www 0a Ul Lm ou 9 2H y P mm DW m du /mJ/ .A .C2 l m MRS m WM W1.

W/7s5es vinternal combustion engine.

UNITED sTATEs PATENT oEEIoE.

WILLIAM W. DEAN, 0F ELYRIA, OHIO, ASSIGNOR TO THE DEAN ELECTRIC COMPANY,

OF ELYRIA, OHIO, .A CORPORATION OF OHIO.

DYNAMIC-ELECTRIC MACHINE.

Specification of Letters Patent.

Patented May 21, ISL?.

Application tiled January 2'8, 191i).` Serial No. 540,591.

To all whom it may concern:

Be it known that I, WILLIAM IV. DEAN, a citizen of the United States, residing at Elyria, in the county of Lorain and State of Ohio, have invented certain new and useful Improvements in Dynamo-Electric Machines; and I do hereby declare the following to be a full, clear, and exact description of the'invention, such as will enable others skilled in the art to which it appertains to make and use the same.

IMy invention relates to generators for electric currents, and more particularly for such as are designed for the purpose of producing a spark to explode the charge of an I have endeavored to produce such a machine which is especially adapted for use on automobiles, motor boats, flying niachines and other vehicles. lVith this object in view I have provided a simple compact machine which requires little space to accommodate it and which is inaccessible to dirt, water and other objects which would cause deterioration of the machine. It is also so built that it can be firmly secured to any part and is not subject to being injured or shifted upon its supports by such blows as these machines are, in the course of their use, liable to receive. ln this particular use, the spark )rodueiner devices should be so ad'ustable i h 1 as to change the time of sparking in order that the relation between the time of spart ing andthe position of the piston in the engine may be adjusted. This is due to the fact that there is a slight interval ol' time between the spark and the explosion of the charge during which the charge is being ignited. There is one point in the revolution of the piston at which it is most desirable `that. the explosion should take place. This pointr -l will call the critical point. The sparlt'iug should take place when the piston is in such a position that the interval of time existing between the sparking and the explosion is sullicicnt to permit the piston to move from that position to the said critical position. It will be readily seen that the piston will lrequire different distances at diil'erent speeds of the engine, and that if the spark wereiexplotfled during a Aslow movement of the piston at a point of point. To remedy this, the time at which the spark takes place Should be adjusted relatively to the position of the piston in the cylinder. Thus, when the piston is moving slower causing the spark to occur later7 I may allow just the proper time for the piston to reach the criticalpoint before the explosion. To accomplish this I make my field magnets adjustable with respect to the other parts of the mechanism. Since the maximum spark takes place at the time the coil leaves the edge of the pole piece, and since the engine and the generator are in synchronisni, by changing the pole I may change the time of sparking. In my machine l ha ve endeavored to realize all these objects and to produce a devi e which may be manufactured by standard maehinerf with as few operations as possible and the members easily assembled. The parts of' my machine may also be manufactured from regular stock, such as is in the market, or can be produced without the construct-ion of expensive machinery.

lt must be readily seen that' a machine which cannot be manufactured, is useless, and that the production of a machineA which is what is known in shop parlance as a good manufacturing proposition, is more useful than one whose construction demands the production of new and expensive machinery, expert labor, and special designing. This is particularly truc in view of niodcrn labor conditions. The structure of my machine is such that l have been able yto adopt standard manufacturing methods to produce the parts thereof. l' show the exterior casing as a tube, though I may, of course, use any other shaped stock adapted for the purpose. The field niagnets consist of straight steel bars which I may roll or press into a shape to conform to the interior jieriplnu'y of the casing. Those shown Aconsist of straight bars whose cross section would be the are of a circle. These magnets are fastened to the casing on the interior thereof. In the form shown in the drawing I have illustrated a pair ofrmagnets, one shorter in length than the other, fastened together and a pole piece which fills up the space between the tWo ends of the magnets and extends part way over the exterior surface of the lsmaller magnet. The easing is closed at each end. The whole easing is journaled upon lstandards so that it may be rotated about its principal axis. lt show 'two armatures` rigidly Jastened together mounted within the casing and adapted to he rotated to cutthe tlux from. the lield, each armature being mounted adjacent to a pole of the magnets. @if course ll may use only one armature and connect the opposite magnetsJ together at the other end. Y

-.nother object which l have in view in constructing my machine, is to proa device whose parts will he rigidly ined together and will not be liable to l during the use of the machine. By airing the parts from. standard stock or in Stock which is formed for the purposes this device by simple operations, lv am enabled to conetruct parts which do not v in shape from other parts oli like kind. Thus, in manufacturing these machines, l can depend upon the relation be tween the parts being` about the .same in each construction. Owing to these two things l am enabled to reduce the air gap in the magnetic circuit and to rotate the armature at a higher rate of speed.

These and other objects of my invention l realize in the particular form which l have shown.

The invention itselt will he liest understood by reference to the following description when taken in connection with the accompanying illustration, showing one specie embodiment thereof, while its scope will be more particularly pointed out in the appended claims.

vltigure l is a vertical cross section taken through the line l-l of Fig. 2. Fig. 2 is a cross section taken through the line lim-ll of Fig. l. Fig. 3 is a section taken through the line lIlM-lll oli Fig. l. Fig. 4. is a diagram ot a part of the circuit arrangements together with the rotatii'ig cam on the end of the armature shaft.

Referring to the drawings, l show standards l andl which at. the bottom spread out into feet 2. '.lhese feet extend the length of the machine as .shown in Fig. l. 'lhe machine is fastened to a base hy fastening devices which connect the feet thereto. At the upper end ot the standards .l show hcarings 25 'for the machine proper.

4- is a hollow casing shown in this form as a cylinder. l may cut this trom any Stand4 ard tubing. The ends oi the casing are closed hy the members 5 and o which etlectively seal lup the parts of the nmehne. The parts 5 and (i extend at the center torming` the hollow trunnions 7 and 'lhes'e trunnions are journaled in the bearings l so that the whole easing may be rocked therein.

At 9 l show -a device by which the casing may be rot-ated.l lt do not contemplate a complete rotation ot this casing, but arrange to move it through an angle sutlicient tor the ur oses of 1n invention. rlthe field ma nets consist ot permanent steel bars l0, ll,

section to contorni to the interior of they casing. ln the form ot my invention illustrated in the drawing, the magnets have taken the shape oi.' an arc ot a circle concentric with the casing. lhe magnets are fastened rigidly to the casing at points diametrically opposite each other. 'lhe magnets 12 and lil are shorter that the othernl and are placed upon them nearer the center ot the cylinder. llole pieces are Shown at t4'. 'lhese pole pieces are .so shaped that they till up the space at the end of the .shorter magnet and are tlush at their ends with the longer n'lagnet.

ln. the drawing l have shown the parts connected together by screws, though l may use any fastening means which will insure a rigid and permanent connection. rlhe tiux cutting member is shown consisting o2 two armatures rigidly connected together. ,l`hese armatures lo and lo are constructed of punehings which are fastened together malting the'well known irl-shaped armature. As shown, they are connected together by the piece i7 and jouriuiled in the hollow trunnions by short axles i8 and lil. VB"he axle 'i9 is hollow. '.l`hrough this' hollow member an insulated contact leads to the electrical terminal 2() through which the current is taken. 'lhe armature conductor 2l lis grounded at 22 vforming the other tin-mine] thereof. Upon the axle lt) I mount a cam Q22 which rotates with tlvI ari'uature and which is adap d to operate an electric switch Q'l-"Qt, the oir ject being to keep the armature short eircuit'cd until a certain point is reached when the cam will operate to suddenly open this circuit canning a spark to go through the primary o1 the iiuluetion coil and thence through itsI .secondary to the engine. lhe memher i7 is bored out along its principal axis as Ishown at Btl, and the conductor 2l passed therethrough. lhis preveiits the use ot. rotating contact arrangements. lhe con: duetor is also protected from ehaling to which it would he subject it it rwere connec-ted with the exterior of the connecting parts. ly keeping it at the center l also avoid unhalancing the armature. v

While ll have shown the invention iu this particular forro, it will be obvious to those skilled in the art that' numeroun and entensive depurturecI trom the 'torni and the details otz the apparatus here shown may he made without' departing trom the Spirit thereof, the. same being herein snown' solely i'or the purpose olli' clearly illustrating one Specific embodiment.

claim:

l. ln a magneto electric machinmtht-i cornhination of a closed easing mounted to rock,

t other, said bars constituting field magnets for said machine, pole pieces at the end ot said bars and an armature in said easing adapted to be rotated to cut the iux of the field.

2. In a magneto electric machine,the oo1nbination of a` closed casing, trunnions for said casing, said casing being mounted to.

rock in said trunnions, a pair of straight bars mounted on the interior of said casing' and adapted to be rocked therewith, one of said bars being longer than the other, the longer bar being nearer the casing and having its ends projecting beyond the ends of the short bar, said bars being the field magnets of said machine, pole pieces between the.' ends ofsaid bars and an armature in said easing adapted to be rotated to cut the flux of said field.

3. In a magneto electric machine, the combination of a closed casing, trunnions for said casing said casing being mounted to rock in said trunnions, a lbar magnet mounted inside said casing to rock therewith, a second bar magnet mounted upon the inside of Said rst bar magnet, seid irst named magnet being longer than said second named magnet and having its ends projecting beyond the ends of the first named magnet, pole pieces between the ends of said mag nets and an armature in said casing adapted to be rotated to cut the ux of said lfnagnets.`

4. In a magneto electric machine', the co1nbinat-ion of a closed casing, trunnions for said casing, said casing being mounted to rook in said trunnions, a bar magnet mounted insdesaid casing to rook therewith, a second bar magnet mounted upon the inside of said rstba-r magnet, said first named magnet being longer than said second named magnet and having its ends projecting beyond the ends of the second named magnet, pole pieces between the ends of said magnets and a pair of armatures mounted in said casing to 'cut the flux of said magnet, said armatures being rigidly fastened together.

ln testimony whereof I ax my signature in presence of two Witnesses.

VILLIAM 'W. DEAN. lxWitnesses:

A. D. T. LIBBY, F, O. RICHEY. 

